Genuine Sony US18650VTC5A 2500/2600mAh batteries, also known as the Sony VTC5A or VTC 5A.  These are a great competitor to the Samsung 25R5 and LG HE2, and allow higher current draw than the Sony VTC5.  These batteries are all fresh stock with manufacturing codes within the last few months.  The problem is there are many counterfeits on the market these are guaranteed to be genuine.  

Please note that these are transitioning to saying Murata on them due to Murata buying Sony's rechargeable battery division. At this time you may receive Sony VTC5A or Murata VTC5A batteries.

Sony VTC5A Official Specifications Datasheet

Quick specs:

• Chemistry:  NMC
• Max continuous discharge current:  35A (with temperature cutoff circuitry at 80 degrees C)
• Max continous discharge current without temperature cut:  30A
• Style:  Flat top
• Approximate Height:  65mm +/- 0.2mm
• Approximate Diameter:  18.35mm +0.15/-0.2 mm
• Weight:  47.1g +/-1.5g
• Nominal capacity: 2600mAh
• Rated Capacity:  2500mAh
• Voltage:  3.6V
• Maximum charge voltage:  4.25V (see specification)
• Not protected
• Origin:  Japan/Malaysia
• Alternate Names:  VCT5A, VCT 5A, VTC5A, US18650VTC5A, US18650VCT5A